Safety helmet life test method

Hard hat period of use: Calculated from the date the product was manufactured.

Plant woven caps do not exceed two years.

Plastic caps, paper caps are not more than two and a half years old.

Fiberglass (PVA steel) rubber caps do not exceed three and a half years.

Exceeded to do testing, testing can continue to use qualified, but still have to be tested regularly, the cycle seems to be a month, if there is a test failed, then the entire batch of the batch scrapped.

How long is the life of a helmet? Where does the regulation come from?

National regulations GB2811: Calculated from the date of completion of manufacture, the production of the caps shall not exceed 2 years. Plastic plastic caps shall not exceed 2.5 years. FRP caps not exceeding 3.5 years are mandatory standards.

According to the requirements of personal protective labor insurance products, helmet manufacturers must produce industrial helmets and labor protection products before they can produce and sell the safety helmets. One of the necessary conditions in the application is that there must be a corresponding helmet. Test equipment for helmet detection.

According to the requirements of the national standard GB/T2812-2006 "Hard hat" and GB/T2812-2006 "Hard hat testing method", the helmet shall be tested for the impact absorption performance of the helmet, the puncture resistance of the helmet, and the lateral rigidity of the helmet. Performance, safety helmet chin strap strength properties, helmet fire resistance, helmet anti-static performance, hard hat electrical insulation performance, helmet UV aging pretreatment, helmet high temperature pretreatment, safety helmet low temperature water immersion pretreatment, etc. Detection, the following briefly describes the detection principle:

The impact absorption performance of the helmet test equipment: Before the helmet is tested, it must pass through the helmet's UV pretreatment, high temperature pretreatment, low temperature water immersion pretreatment, and then use the helmet vertical distance wear height measuring instrument to select the appropriate head model. Put the helmet on the head mold and use the drop hammer to fall freely from a height of 1 meter from the helmet to see the force value after the impact. If the standard requires more than 4900N, then the helmet is judged to be unqualified, and the shell pieces are detached. Considered unqualified.

The puncture-resistance performance of the helmet test equipment: The helmet is pretreated with ultraviolet pretreatment, high temperature pretreatment, and low temperature water immersion. The appropriate headform is selected according to the vertical distance of the helmet and the helmet is worn on the headform. At the top, use a puncture hammer to free fall from the height of the helmet 1m away, and to find the weakest point in the center of the helmet, observe whether the alarm and the display light flash, touch the head mold as unqualified, ie if the machine alarm, Flashing the display is judged as a failure of the helmet.

Hard hat test equipment safety helmet chin strap with strength properties: use of puncture test helmet, wear on the head mold, the chin strap through the mandible of the two shaft tight, in the standard 150N / Min is first loaded to 150N, and then continuously loaded at a speed of 20N/min until the lower jaw is disconnected or loosened, the maximum load is recorded, and if the maximum load is 150N-250N when it is disconnected or relaxed, it is regarded as The safety helmet is qualified, otherwise it is unqualified.

Hard hat detection equipment helmet lateral rigidity performance: the helmet is placed between the two flat plates of the test device with the brim on the outside and as close as possible to the flat plate, and the vertical pressure is applied to the helmet through the test device, first applied to 30N, kept 30S, record the plate spacing Y1 at this time; then press at 100N/min to 430N, maintain 30S, record the plate spacing Y2 at this time; then reduce the load to 25N and then 100N again at 100N/min. /min Increase the load to 30N, record the plate spacing Y3 at this time; calculate the difference between Y2 and Y1 as the maximum deformation, and the difference between Y3 and Y1 as the residual deformation. The standard stipulates that the maximum deformation is not more than 40mm, the residual deformation does not exceed 15mm, and the cap must not be detached.

Hard hat testing equipment helmet flame retardant performance: use high-temperature impact test after the helmet, in accordance with the standard requirements of its combustion, such as combustion follow-up burning time does not exceed 5S, hat shell is not burned through is considered qualified, and vice versa Failed.

Hard hat testing equipment, helmet anti-static properties: the use of high resistance meter, electrodes, conductive adhesive on the pre-tested helmet to test the hard hat test twice, take the average of the two is the surface resistivity, standard The surface resistivity of a qualified helmet shall not exceed 1×109Ω.

Safety helmet electrical insulation performance of helmet testing equipment: The helmet is tested for electrical insulation using a helmet electrical insulation tester. According to whether the helmet has ventilation holes, the appropriate test method is selected to record the size of the leakage current. Leakage current does not exceed 1.2mA as qualified.

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